Remove dead code GetSimulcastSsrcs from simulcast.{cc,h}.

Bug: None
Change-Id: Ib1315bb65ebbf6c33008c9522451d9782119f5ca
Reviewed-on: https://webrtc-review.googlesource.com/47561
Reviewed-by: Erik Språng <sprang@webrtc.org>
Reviewed-by: Per Kjellander <perkj@webrtc.org>
Commit-Queue: Rasmus Brandt <brandtr@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21974}
diff --git a/media/engine/simulcast.cc b/media/engine/simulcast.cc
index 6d68453..f2909d3 100644
--- a/media/engine/simulcast.cc
+++ b/media/engine/simulcast.cc
@@ -61,14 +61,6 @@
     kDefaultConferenceNumberOfTemporalLayers[webrtc::kMaxSimulcastStreams] =
     {3, 3, 3, 3};
 
-void GetSimulcastSsrcs(const StreamParams& sp, std::vector<uint32_t>* ssrcs) {
-  const SsrcGroup* sim_group = sp.get_ssrc_group(kSimSsrcGroupSemantics);
-  if (sim_group) {
-    ssrcs->insert(
-        ssrcs->end(), sim_group->ssrcs.begin(), sim_group->ssrcs.end());
-  }
-}
-
 int FindSimulcastFormatIndex(int width, int height) {
   RTC_DCHECK_GE(width, 0);
   RTC_DCHECK_GE(height, 0);
diff --git a/media/engine/simulcast.h b/media/engine/simulcast.h
index 31fdcae..a2d27ed 100644
--- a/media/engine/simulcast.h
+++ b/media/engine/simulcast.h
@@ -43,9 +43,6 @@
 
 int GetTotalMaxBitrateBps(const std::vector<webrtc::VideoStream>& streams);
 
-// Get the ssrcs of the SIM group from the stream params.
-void GetSimulcastSsrcs(const StreamParams& sp, std::vector<uint32_t>* ssrcs);
-
 // Get simulcast settings.
 // TODO(sprang): Remove default parameter when it's not longer referenced.
 std::vector<webrtc::VideoStream> GetSimulcastConfig(size_t max_streams,